Centrifugal Pumps > MRApplications

MR is a liquid-ring pump specially designed for pumping liquids containing air or gas. The pump is for use in food, chemical, pharmaceutical and similar industries. The pump is mainly used for CIP-return applications.

Standard design

All product wetted parts, i.e. pump casing, casing cover and impeller are made of acid-resistant steel AISI 316L. Seals are made of EPDM rubber. Cap nuts, legs, leg brackets, adaptor and shroud are made of stainless steel. The shroud has noise absorbing lining inside.

Shaft seal

On MR-166S, -185S and 200S, the mechanical single seals have stationary seal rings of acid-resistant steel AISI 329 and rotating seal rings of carbon. The MR-300 has mechanical single seal with stationary seal rings of carbon and rotating seal rings of acid-resistant steel AISI 329


How It Works

The MR liquid ring pump works on the basis of centrifugal force, as do the Alfa Laval LKH and SolidC pump ranges. However, in the MR design the fluid is not directed into a ring or volute type casing around the periphery. Instead it passes into channels on either side of the impeller, in the front and back plate of the pump.

These side channels increase in volume as the Impeller passes the suction port. This creates a vacuum and draws liquid in. This volume is then automatically reduced at the discharge port, creating pressure and forcing liquid out, thus providing the pumping action.

A proportion of the centrifuged liquid is retained around the periphery and re-circulates, forming a “liquid ring” that is used to maintain the prime.

The combination of expansion and contraction of volume, centrifugal force and liquid ring construction increases the permissible gas content in the fluid being pumped. This in turn makes this type of pump particularly suitable for fluids with entrained gases.

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